SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 393

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

24. External Memory Bus
24.1
24.2
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Description
Embedded Characteristics
The external memory bus allows external devices connection to the various embedded memory
controllers of the microcontroller. The external memory bus handles control, address and data
bus of each embedded memory controllers. The SAM3X embeds a Static Memory/Nand-
Flash/ECC Controller (SMC/NFC/ECC) and a SDR-SDRAM Controller (SDR-SDRAMC).
Furthermore, the external memory bus handles data transfers with up to eight external devices,
each assigned to eight address spaces. Data transfers are performed through a 8-bit or 16-bit
data bus, an address bus of up to 24 bits, up to eight chip select lines (NCS[7:0]) and several
control pins that are generally multiplexed between the different embedded memory controllers.
• Only present on 144-pin and 217-pin versions of SAM3X
• Managing SMC, Nand Flash and SDR-SDRAM Controller accesses offering:
– Up to 8 Configurable chip select
– Programmable timing on a per chip select basis
– 16-Mbyte Address Space per Chip Select
– 8- or 16-bit Data Bus
– Word, Halfword, Byte Transfers
– Byte Write or Byte Select Lines
– Programmable Setup, Pulse and Hold Time for Read Signals per Chip Select
– Programmable Setup, Pulse and Hold Time for Write Signals per Chip Select
– Programmable Data Float Time per Chip Select
– External Wait Request
– Automatic Switch to Slow Clock Mode
– Asynchronous Read in Page Mode Supported: Page Size Ranges from 4 to
– NAND Flash Controller supporting NAND Flash with Multiplexed Data/Address
– Supports SLC NAND Flash technology
– Supports Hardware Error Correcting Code (ECC), 1-bit error correction, 2-bit error
– Detection and Correction by Software
– Supports SDRAM with 8- or 16-bit Data Path (217-pin SAM3X)
32 Bytes
buses
detection
SAM3X/A
SAM3X/A
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